Can high temperature cause dropsy? Early this morning I noticed my one betta that is in my divided cycled 10 gallon was acting odd but he ate 2 pellets...I didn't think much of it because they're doing road construction infront of our house so everything has been shakey here and I figured he was probably just a little stressed out because of it.....When I checked the thermometer a little later though the temperature was up at 89 and the heater was not shutting off! My betta was pale and starting to look a little puffy he was also laying at the bottom... I did a 50% water change to cool the water slightly and have my one guy floating in his cup with 1.5 tsp epsom salt/gallon... Is there anything else I can do? I feel terrible I didnt notice the temperature that high at first...Its usually a really reliable heater (it is an aqueon) so i didn't even think to check that... My other betta is acting normal right now.

Thankyou. I have the heater off for now because it wont turn off on its own. My tank is down to 82 at the moment...My other guy Robin is still acting normal. I hope my little sherlock can pull through..I feel really bad...I gave him some tannins as well. He still looks pretty pale.

photos before I added the tannin:

Here you can see the scales raised a little:

Should I put him on maracyn or just stick with the epsom salt and tannins for now?